condition mean min max ZT0-3 4.079585 4.079585 4.079585 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 8.542655 8.542655 8.542655 ZT16-19 2.24464 2.24464 2.24464 ZT20-23 4.499405 4.499405 4.499405